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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ab5d17d5e8ac1d4635c718c626d6c14908d1a0363241fe3c55660570c7a369' 
  AND token = 'IeDfaDoXvgsdgcK8kATM+yTDz1nAwm9v0yHgHWBpvd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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