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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885b65814ee9c102aba41432942e2d349c7ad618c5b0c27785a19612a940f8e0' 
  AND token = '9RJ+xOyhL0AF0v5F4eKPcIiNKaHl6ryQQmpVQ8e152c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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