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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0210ba9677a227bc5c6be52b0314445a097d6b85191862b3587158c4e7b1d745' 
  AND token = 'Pjwnh9rQju2+FYMg90HSe5PP2YslA0D1IEJ0y/L0CO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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