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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439f98fe77d4cd4e88beb6f2a8d4e2692ed1a473ec85eb2accd85fa4c8fc02b1' 
  AND token = 'MoFrC5JrbpMiHWb7z6tgyGA+qqEcZBo6HHAmvLOJS8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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