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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b0c61e9a9a3ff9c710653f2a2c380e9c41a9d850fb12296045c698a4111bfc' 
  AND token = 'Aw7q2MS8ZLhPrpWsTvLW1Wey8FZet2dTGeW6TYf3MCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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