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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8c1caf900b0a81214e86f53e6441d8de6e483199f251080bcede7beac84934' 
  AND token = 'vbNQ5wa/YGwuh9F1WF+pmzjz2vhsk7RzP4lacR0q6oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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