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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82347350fb434101c8d372ae0425aaf64e68ec68c85ea4302c570de8c00ba50' 
  AND token = 'D7GzLQlOER54yUENh62kp2YYqAJe2EidxvN4sFpx7AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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