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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2761a8b5e48280b3cd44507ab6304a4a7fe0d308427fab66fb87ad3706e2c737' 
  AND token = 'RHsPG7S8ITrTKI+BntfXil0HGSZ9pOyVgRS+IlKonrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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