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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8252a072c9a2ae6eefb90da14f9a63cd7000cdda0c988ebc14f3d9e86ea9077' 
  AND token = 't8cePlHVQKMs6F0L1A9tgVLhluiWwzVouKFjRrX8bts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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