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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54743db4c2268b94787ef51877b22be4836ba6be18a56da94199020eb0fb9e17' 
  AND token = 'zwHSrPMlptqMk1f6RLpCo/hqNTE9+iXADSC7X3xN+Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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