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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35df519638caf618da9a83d5874df35b40abbcd64f74e1ca582b98bd3c90d5bb' 
  AND token = 't7SLpotu39alFvkEHP86AeJHvO1d1qPgJ14AYlj31B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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