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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7232862879d36b36b42318c76416ae60c0e6de89cc4acc5cb123741b99258612' 
  AND token = 'DS8XWmDl7nTXco16qAnzWGudewWOlgP80Jd3rk4Ujys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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