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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9ab9405afe469ccfb757ac5296c0f1c5157cd3aafab05a18780ba3910400b9' 
  AND token = '5ECvx5ePuIsUhZ+dgVDcxJ6aCIbmI9kq01XTzIWXw3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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