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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5405b480ffba6ac1778abfb55565275264efc8e1b0a11385ceb229e4841d74' 
  AND token = 'MwiO1HLGv8pc3ploRndraCx54obyoUPc/tUDlV/k5+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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