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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8ea1b9bd59e23852ef2b15dd38b723b72895435505ea5698c3471ce3afc0c3' 
  AND token = 'qjvQbKqV+QcoKMMMANPViMZaaNw3k2B4hTRN6cu3pAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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