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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fe104b90e05cf466a03ab2b7b199d296ab568b4f1e8b02dc13b75ad7a69a95' 
  AND token = 'PvVygEH9zLbiknO4BYtKtpt8YZM+6fPtG8aEODHGlsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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