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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6581a70b8ab03d16007f5cb2852cd54f1600d52d0b18f42bdb43c15818c4c4c8' 
  AND token = 'ggkX8ZQBTrazwjgl/7eD3sM0bh44Tgxd4cHgRBRp018=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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