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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430c008d47409db4f86355dc35c3128f49daac140b20dab85c7e9e7acdd32721' 
  AND token = 'j2kKSvtr5gYP0aN1poBFcukldy8kAAlmg/gqbdE62ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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