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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c711d7a7febd438a65fe812f35a81ded4e2b07a30a01706b43a6ffca5ffc99' 
  AND token = 'n0+2/uEYX8d97IKrrW8j6bVp3IO0pvHD40ZHu2UepBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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