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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61a28acc37286b94495390d8db28043e0136e077d5a1afa1c27d7caeb17a332' 
  AND token = 'I4IckJba7JlBkZrtYfU0wun6iLU6Bh/D3v1i50uDM2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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