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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cdbff99eb1b3fc22e3c43b04345372ecc92c550190ebee5fae132dfafe1498' 
  AND token = 'wa0T707N15WNAtNSKsO+muRDexFqyuipH5G5mR75qHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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