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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fefd4397fef8460acbb8b718d198d99a13a5d6567769e739f0a1264e83b11e' 
  AND token = '5pLfiWmsXlfXG2/ATE5214VzWe7h2PqxZwf16+y+jEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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