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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7135cf4b014cdb4661a598b4abaf845c8354cfc46e76957b0f49abc096445bc7' 
  AND token = 'pKvwnlvWGVUCc5sb8ZBtkSXnOp9ntsUg/tFychg81OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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