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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b280e12964d72845319edfc030babb52f66072ea80672e540f68657b816b2a65' 
  AND token = '83FLSbDUchwHAwDpJMiUosNOqwO2plLpXIys0i/3K6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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