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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccb17b29ec6e68e1034d355270f81938fbb7fbd152c1a734363a6df77049c2c' 
  AND token = 'HbyNEr+1wr912pIPGWP0yJu+CdGtqptWmgVSs6tHERs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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