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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ec66d30188e80741bdfac61dc94c19cb317374c20500303d4b564ed19e76fc' 
  AND token = 'Ca6vMu42veYmt03qbN9Y5iCpE3iN16zwJ87iAsh4Z1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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