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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a82d058f4f100d3b79b36b0f2967b0dfa92693e6e2e7071db3a6a93935701f' 
  AND token = 'm3P6yF7UBHAxNC7YhV42p8Be2Fu3wDQvD72QLfthq8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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