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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1dac1d3f3d6749b649a89d914cfe0d00c5431f60a85536bf900787c09eba34c' 
  AND token = 'GMalmkYvhKcGFFcNUhYu6ki6+ZH3KcxhyDBeUkOVfLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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