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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98b580bb0453dceb85a3c5066f19b2bebce365f4402099fc5e2004df10337dc' 
  AND token = 'GNRBvriJbya6SG1Zo/zVgcuWG89wJ06DhzFCEdJWdo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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