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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5554bcbcc2b09a5e71ba7778ebbba9b63c57664e0789de72e12406ded409de92' 
  AND token = 'tJ+tMmE+I3K9S/bR0tV7KjdC72CcWD4xfaofJQvrGjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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