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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92bdc316b15f62415f94234bbce6baf7aa07428b322f9162d4fe8c024828940' 
  AND token = 'SWHlhyauCpSFS2nQpohWz7ADX020wKDBJGb3WU3SHUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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