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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfbb97ad38f0832472aa78061d620fbd81a7b0b5091357cd10a1bd9e18acc7a' 
  AND token = 'YUlhH/41zQeYNuHUdv7Tcq4U+R8ruuJEcCvQDzCbWlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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