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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc67decfe100f92441268820b924cec2f037ff1fa8fc11b5542f0a5df655ba8b' 
  AND token = 'X4p8hYMEBuN6bgwzsPzor8HiPqgnrgZhYyWcN7lTWu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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