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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06e55458419dcc528a3a1df9300f65b9ebf538b2b4d0d2e38ad80f71c319eea' 
  AND token = 'GelAd7DSQ7GyoyBsYe6Jp8urbJ0/IG6J7OPhuQ4uJ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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