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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff63e3fb174d42da0a7d31c907c60363d7843189e0f9a46fed9592411aa6fa0d' 
  AND token = 'SNubdqIHGG0Ezc2HkHeK+0pkoJ/2XEO5DYsFGJKCL+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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