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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a581709d0343021081f3ddb80f7f12240ee5ff650051c6524b25113cea491f35' 
  AND token = 'r4BpVzKeXHpFpps66++XPXgRU/lNRm8QsEM9FsKSPx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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