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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d57d4cdea4d02a0f8bfedca5d7005f182ef1888753b14ad14651b150da09fd' 
  AND token = 'xbIhIQVwnPennMkilzl9seyB4rHCTGG4DOi2pUxf9Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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