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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e92f8072e4d67a521ef761fef83fea6c74f525afad5c7d7fc2dbe5f65e7112' 
  AND token = 'cJ9VwaVYF92+cv7mjYPO8gIQMgNFl+zhedc6Kg4fY6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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