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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a5040b372007523be9b9a1345805a812b92dac9c777cb0831508cb1834b104' 
  AND token = '8+HnnAta5WR0XF0PwMv5HaJggwwoH0RoqOQGp5o+oTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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