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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879395dac4d9440e871839cb3f664a9ec76ddf9efcdd3e58bc6d92e9592c7cf8' 
  AND token = 'MciG0Xg/ldAvsK8Km2QL/sYxJInnOnfBaIbv9aYpwms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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