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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932eca18687853fd9803640a1c560dc93153e0de2156836c57395441030c1eef' 
  AND token = 'cqgoG8puOMy0uDQFPaF77RQRCxzmSJULDEsK2G8clhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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