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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ee8dae8e6282fb289d17d17c7fc18bc198b3118ed96700163507b2c71da176' 
  AND token = 'rszsAjMhtM5VGvhpfCbaV7icZqFwUSagApf73R7NeNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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