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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fd37b94305a585accf1850d893280533c61cf1d95ce531f1df5e9a637b5f87' 
  AND token = '0xKmdYnmwy2pfTBk39KaiDqzrnI5ioE4DrSmqH6wl3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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