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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec792f5d1b775b799a6ed1b42a2bf2383e172871be7b7e71095e40b9d34a057' 
  AND token = '+qeQkKTtPPcd5esHXTGjiin0b2QdpIrI2iUDfXwffs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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