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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2ac3bb66780b898935ae2319d3f84fdc64dbdb43e9e6bdee03418a77b39e9c' 
  AND token = 'fzWsQHfLoRvjKA8FPYtuPd+iv7HGEXxdhIBHa0Qfh0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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