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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1c374a5c0770f92912712eecc95941cf9d569a5735ba4581949fcbc88ca9fc' 
  AND token = 'sj+R6lXA1zx/9U6NSLyJbFDNLNH1FI9MsbaeN6IlDPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}