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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c0dece2dbfc2a709b7e60dcde2d164dec1eaf8950b183a32ff0204471339cc' 
  AND token = 'n5SLEPWLvTVJM/dWT2A9TzhD9aba3JEEhQfpDE0a0ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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