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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c5cc735c0fdd43f4f52e9cc3a1a896c3366add6bbb006d1c3755bfc88bab29' 
  AND token = '+n+PEQTEepN2Apv+B7nNtT5F2ngdMMZio+8B3dVSzCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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