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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae1b899d4398c2313c5e04af5cd2e481712ccf69c85b97ebc4ebf304e9fdf9f' 
  AND token = '2tcIUM6Bq5RjFLuoa2va8UdARO1XW2L294GsaxBaBHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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