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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5c979291b680c1219862e608aa9b4a9072e948703f95f1b08b74734923fcf9' 
  AND token = 'fiIYr+4IYRYKowef2i80Uc9BX1BnG0tsEsSz/0haZx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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