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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403976ef251e084af7b57f87df8e7540343b541f7cfac04a4b436e123b2c7d50' 
  AND token = 'x1YVYVDBmQxvH4z9tnH8caJMj36+g72IKti8+FtjF1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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