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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58645b6b1671803abceeff22627fcbac57479b45ca7f24a32699476f7175a6e7' 
  AND token = '3ixCLbBF/fdhx93mED3A8a3CYoPEjahyga8zUVlyxvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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