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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e312a5816c0fd61a8a0a258f6d5346592f4788399d63ab0b453a1aa95e0026' 
  AND token = 'yLY+z0ci/0qutL3JAM3Kw8R8oDVQXdfHJlX5PtkgWYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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