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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34afcc5eecb414771f22af4e8527ba85a881b589836edb6988d1724b7a1576fc' 
  AND token = 'FonSg4SvojEiv6iE5Wui12MC/VHDMGih3NxOY225f2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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