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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3f6d02b109038756bebe55409a201cdc5e4dc9a8ab4ddbd7a5b438a8cfb7ba' 
  AND token = '3SqIamwDWdh/AaNl9VC2nfDe4yO5og0QF9ezdjoKDZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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