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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1318dd73cf0516a9c69018bf7f5a9f7e7c3a2016dc8359f0e3039cc5ed317b' 
  AND token = 'yiPdyEepbRhzXlZF3Jp8DIJJiyHJU8czupjIbQtX2TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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