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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d82b986c775acf9ed1406e4844470d2e6204a51aba287dc2aa1888ec819e4ac' 
  AND token = '4WDFABL7PuaBstwCia/1ROGqN2+qWjQiQ2WkdVytqgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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