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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752399b40be4735a75881bff4385030880e98839e125ab87bfb5d6b903f16275' 
  AND token = 'r6LHNUjRZxZFfwM1AFicj0q3RpjBy8lgX2d2ysEbU/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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