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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb2bab61ee319ea4ac989a1b8cabc7eb371caa503b0ac57978a5b2cfbe71bca' 
  AND token = 'uOqG082xprNdjNpo865Wl/BZ1V+piF4nTfdVCMbc4yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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