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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815b640e04c8dbb7292801226f20b89d771389ba76bacc92399323411643ec26' 
  AND token = '44Su8+Bdh81IgjZAR7eg6FP6QrYrfNeybHcO3xA/8Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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